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The mkiv Supra Owners Club

Tach wire confusion


Guest AlmightyJu

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Guest AlmightyJu

Hi guys, I'm trying to find the tacho wire coming from the igniter (its a N/A 93) since I want to get the rpm signal for a circuit I'm making.

 

I think i found it but not sure, the pics are taken from the passenger side down by the ECU and theres a black and white wire and it looks to be in pin 29 which is right according to the manual I have, but the voltage doesn't seem to change when i rev. with my multimeter (i dont have an oscili :/) on the ac setting it reads about 23 to 26v and on dv its almost a steady 9. I was expecting it to range from 0 to 200V or 12V or maybe even 5V, but it doesn't seem to budge :blink:

 

Am I missing something or have I got the wrong wire? I'm at a loss :/

 

thanks!

IMG_20130211_192915.jpg

IMG_20130211_192925.jpg

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